subinvestigadores

English translation: Assistant Researcher

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Jalali
... Worked as a co-researcher on landslide studies by geophysical methods. Worked as
a co-researcher on change detection of coastal line of Oman sea, using RS/GIS. ...www.scwmri.ac.ir/staff/jalali_research.html - 18k - Cached - Similar pages

Explanation:Rather than ask you to take my word for it, here are definitions obtained from a reputable source:

DEFINITIONS

Principal Investigator (PI)
This title identifies the individual responsible for the conduct of the project. This responsibility includes the intellectual conduct of the project, fiscal accountability, administrative aspects, and the project's adherence to relevant policies and regulations.

Co-Principal Investigator
This designation refers to individuals who share the responsibility for the project with the Principal Investigator and therefore requires the same qualifications.

Co-Investigator
This title designates key personnel for a project, but without the oversight responsibility of a Principal Investigator. Individuals do not need to meet the qualifications of PI under this policy, but should be considered key to performance of the project.

Project Director
This title is a synonym for Principal Investigator on non-research sponsored programs or for "program-project" grants.

All of the above titles are recognized as having official responsibility for the sponsored program. Sponsors generally will require approval of their substitution.